istio

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apiVersion: networking.istio.io/v1alpha3
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kind: ServiceEntry
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metadata:
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  name: regex-extsvc
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  namespace: testns
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spec:
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   hosts:
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   - regex.extsvc.com
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   ports:
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   - number: 9003
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     name: http
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     protocol: HTTP
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   resolution: STATIC
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   endpoints:
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    - address: 127.0.0.2
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      ports:
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        http: 8080
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      labels:
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        version: v1
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    - address: 127.0.0.3
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      ports:
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        http: 8081
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      labels:
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        version: v2
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---
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apiVersion: networking.istio.io/v1alpha3
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kind: DestinationRule
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metadata:
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  name: regex
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  namespace: testns
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spec:
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  host: regex.extsvc.com
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  subsets:
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    - name: v1
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      labels:
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        version: v1
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    - name: v2
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      labels:
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        version: v2
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---
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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  name: regex-route
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  namespace: testns
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spec:
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  hosts:
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    - regex.extsvc.com
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  http:
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    - match:
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      - headers:
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          foo:
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            regex: "b.*"
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        sourceLabels:
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          version: v1
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      route:
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      - destination:
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          host: regex.extsvc.com
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          subset: v2
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        weight: 100
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    - route:
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      - destination:
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          host: regex.extsvc.com
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          subset: v1
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        weight: 100
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